GIS data used by the Irrigation Module

In addition to the tables from relational databases (ORACLE and
Access), the Irrigation Module is linking to GIS files. The used file
format is ArcView shapefile (*.shp). Each shapefile is linked through
an index file (*.shx) to an attribute table in dBase format (*.dbf).

Neither the geometry of the spatial data nor their attribute tables are modified, as they are only used for spatial selection.
The location of the files is either offline (on a local drive) or
online (on a network drive). At both locations, the same directory
structure is assumed, i.e. the files are residing in the three
subdirectories base data, thematic data and balancing.

The names and relevant fields of the GIS files are contained in table TShapefiles within the database application. Name and table structure are taken from the DVS (Digital Visualisation System)